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Gypsum Products company New Industry of this year
Mines and New Mill at Piper and Gypsum Eight miles east from this City-Inexhaustible supply of raw material
Democrat News
Friday, December 16, 1921
The property was located several years ago by the late Darcie C. Bard, prominent geologist of Butte and Seattle. The estimated
deposit of gypsum at the companies mine near Gypsum, Montana, on the C.M. &St. P. Railway's Winnett line, one and one-half
miles from Heath, Montana and 10 miles from Lewistown is placed at 8,000,000 tons and with a reserve supply at Piper, Montana a
few miles east of the Gypsum property of several million tons. It is estimated roughly that the Northwest Gypsum Products
Company has 10,000,000 tons of rock in sight for future operations near Lewistown. At present all effort is being concentrated in the
development of the mines and mills at Gypsum. Construction began in June 1921. Mr. G.J. McEntyre, formerly of Tacoma, Wash.,
has been in charge of operations and development. Sidetracks have been constructed and a gravity water system installed from a
spring rising on the property. The mill consists of an Lshaped structure of two wings each 120 feet long by fifty feet wide and 40
feet high. The daily capacity of the mill is 150 tons.
The equipment in the mill consists of a large Gates gyratory crusher, a fifty foot revolving cylinder drier equipped for burning either
coal or fuel oil, a four roller Raymond Pulverizing mill, calcining kettles equipped for either coal or oil fuel, storage bins, conveyors,
elevators, Boughton ton mixer and Bates Valve Bag Sacker. Each unit and machine in the plant is driven by an independent electric
motor. A private power line from the Montana Power Company's Spring Creek plant obtains the power approximately seven miles
westward.
The estimated costs of production in this plant are low as compared to other plants not so favorably situated. Natural gravity is used
to transfer the product from one machine to operation to the next there-by saving greatly on hoisting and conveying expenses both
in initial costs and operating costs, to say nothing of the upkeep and repairs on the same. The mine opening is forty feet above the
level of the railway grade and 150 feet back from the same. The gypsum rock comes from the mine to the entrance of the mill
where it is dumped into the crusher and ground to one and one half inch ring. Then by gravity to a conveyor belt to the railway cars
for the crushed rock shipments or diverted from the crusher by gravity to the drier which it passes through and thence to the
Raymond mill by gravity where it is ground to a 90 per cent fineness. From there it is lifted by an air vacuum system to storage and
the additional moisture driven off and from there it is dumped into the cooler pits and elevated to a storage bin of 600 tons capacity.
As needed the ground product then plaster of paris or stucco, is taken by spiral conveyor and elevators to a smaller bin above the
mixer and automatic sacker where it is prepared for commercial use and sacked for shipment and moved into the car alongside,
read for the consumer. All storage bins are built independent of the side walls of the main buildings to keep them free from any
moisture, which might be absorbed from the exterior walls.
The products of the plant will be plaster of paris, stucco, dental and casting plasters in addition to selling crushed gypsum rock to the
cement manufacturers. Three percent of all cement is composed of gypsum rock, which is shipped in bulk by the carload.
To be successful a gypsum company must have high-grade rock and large quantities of it as the rock sells for prices comparative with
coal. Therefore, the mining costs must be low, the quality high and markets accessible. The N.W.G.P. Co. has the latest approved
machinery and equipment obtainable, it's conveying and elevating machinery is largely eliminated by gravity and its rock supply
sufficient for several hundred years running at capacity, and the quality of the rock is perhaps as high in purity as is ever found. The
vein is 14 feet thick and lies in a large horizontal sheet with a slight dip to the west. The mining costs are low and dependable. It
assures the customer of a minimum of mine troubles at the source of this raw material and dependable deliveries. Electric drills are
used in the mine for borings and the room and pillar system of mining is followed.
Mr. G.J. McEntyre, the vice president and general manager, is well known to the gypsum industry having been associated with it for
the past twenty years. Mr. R.M. Calkins, Jr. the president and treasurer has been a resident of Montana for many years engaged in
various development enterprises and recently in the shipbuilding business in Seattle until coming to Montana to open up the
N.W.G.P. Co. this spring. The company maintains an office in Lewistown and employs from 25 to 30 men at its mill and mine near
Heath.

Gypsum Products company New Industry of this year
Mines and New Mill at Piper and Gypsum Eight miles east from this City—Inexhaustible supply of raw material
Democrat News
Friday, December 16, 1921
The property was located several years ago by the late Darcie C. Bard, prominent geologist of Butte and Seattle. The estimated deposit of gypsum at the companies mine near Gypsum, Montana, on the C.M. & St. P. Railway’s Winnett line, one and one-half miles from Heath, Montana and 10 miles from Lewistown is placed at 8,000,000 tons and with a reserve supply at Piper, Montana a few miles east of the Gypsum property of several million tons. It is estimated roughly that the Northwest Gypsum Products Company has 10,000,000 tons of rock in sight for future operations near Lewistown. At present all effort is being concentrated in the development of the mines and mills at Gypsum. Construction began in June 1921. Mr. G.J. McEntyre, formerly of Tacoma, Wash., has been in charge of operations and development. Sidetracks have been constructed and a gravity water system installed from a spring rising on the property. The mill consists of an L shaped structure of two wings each 120 feet long by fifty feet wide and 40 feet high. The daily capacity of the mill is 150 tons.
The equipment in the mill consists of a large Gates gyratory crusher, a fifty foot revolving cylinder drier equipped for burning either coal or fuel oil, a four roller Raymond Pulverizing mill, calcining kettles equipped for either coal or oil fuel, storage bins, conveyors, elevators, Boughton ton mixer and Bates Valve Bag Sacker. Each unit and machine in the plant is driven by an independent electric motor. A private power line from the Montana Power Company’s Spring Creek plant obtains the power approximately seven miles westward.
The estimated costs of production in this plant are low as compared to other plants not so favorably situated. Natural gravity is used to transfer the product from one machine to operation to the next there-by saving greatly on hoisting and conveying expenses both in initial costs and operating costs, to say nothing of the upkeep and repairs on the same. The mine opening is forty feet above the level of the railway grade and 150 feet back from the same. The gypsum rock comes from the mine to the entrance of the mill where it is dumped into the crusher and ground to one and one half inch ring. Then by gravity to a conveyor belt to the railway cars for the crushed rock shipments or diverted from the crusher by gravity to the drier which it passes through and thence to the Raymond mill by gravity where it is ground to a 90 per cent fineness. From there it is lifted by an air vacuum system to storage and the additional moisture driven off and from there it is dumped into the cooler pits and elevated to a storage bin of 600 tons capacity. As needed the ground product then plaster of paris or stucco, is taken by spiral conveyor and elevators to a smaller bin above the mixer and automatic sacker where it is prepared for commercial use and sacked for shipment and moved into the car alongside, read for the consumer. All storage bins are built independent of the side walls of the main buildings to keep them free from any moisture, which might be absorbed from the exterior walls.
The products of the plant will be plaster of paris, stucco, dental and casting plasters in addition to selling crushed gypsum rock to the cement manufacturers. Three percent of all cement is composed of gypsum rock, which is shipped in bulk by the carload.
To be successful a gypsum company must have high-grade rock and large quantities of it as the rock sells for prices comparative with coal. Therefore, the mining costs must be low, the quality high and markets accessible. The N.W.G.P. Co. has the latest approved machinery and equipment obtainable, it’s conveying and elevating machinery is largely eliminated by gravity and its rock supply sufficient for several hundred years running at capacity, and the quality of the rock is perhaps as high in purity as is ever found. The vein is 14 feet thick and lies in a large horizontal sheet with a slight dip to the west. The mining costs are low and dependable. It assures the customer of a minimum of mine troubles at the source of this raw material and dependable deliveries. Electric drills are used in the mine for borings and the room and pillar system of mining is followed.
Mr. G.J. McEntyre, the vice president and general manager, is well known to the gypsum industry having been associated with it for the past twenty years. Mr. R.M. Calkins, Jr. the president and treasurer has been a resident of Montana for many years engaged in various development enterprises and recently in the shipbuilding business in Seattle until coming to Montana to open up the N.W.G.P. Co. this spring. The company maintains an office in Lewistown and employs from 25 to 30 men at its mill and mine near Heath.

Gypsum Products company New Industry of this year
Mines and New Mill at Piper and Gypsum Eight miles east from this City-Inexhaustible supply of raw material
Democrat News
Friday, December 16, 1921
The property was located several years ago by the late Darcie C. Bard, prominent geologist of Butte and Seattle. The estimated
deposit of gypsum at the companies mine near Gypsum, Montana, on the C.M. &St. P. Railway's Winnett line, one and one-half
miles from Heath, Montana and 10 miles from Lewistown is placed at 8,000,000 tons and with a reserve supply at Piper, Montana a
few miles east of the Gypsum property of several million tons. It is estimated roughly that the Northwest Gypsum Products
Company has 10,000,000 tons of rock in sight for future operations near Lewistown. At present all effort is being concentrated in the
development of the mines and mills at Gypsum. Construction began in June 1921. Mr. G.J. McEntyre, formerly of Tacoma, Wash.,
has been in charge of operations and development. Sidetracks have been constructed and a gravity water system installed from a
spring rising on the property. The mill consists of an Lshaped structure of two wings each 120 feet long by fifty feet wide and 40
feet high. The daily capacity of the mill is 150 tons.
The equipment in the mill consists of a large Gates gyratory crusher, a fifty foot revolving cylinder drier equipped for burning either
coal or fuel oil, a four roller Raymond Pulverizing mill, calcining kettles equipped for either coal or oil fuel, storage bins, conveyors,
elevators, Boughton ton mixer and Bates Valve Bag Sacker. Each unit and machine in the plant is driven by an independent electric
motor. A private power line from the Montana Power Company's Spring Creek plant obtains the power approximately seven miles
westward.
The estimated costs of production in this plant are low as compared to other plants not so favorably situated. Natural gravity is used
to transfer the product from one machine to operation to the next there-by saving greatly on hoisting and conveying expenses both
in initial costs and operating costs, to say nothing of the upkeep and repairs on the same. The mine opening is forty feet above the
level of the railway grade and 150 feet back from the same. The gypsum rock comes from the mine to the entrance of the mill
where it is dumped into the crusher and ground to one and one half inch ring. Then by gravity to a conveyor belt to the railway cars
for the crushed rock shipments or diverted from the crusher by gravity to the drier which it passes through and thence to the
Raymond mill by gravity where it is ground to a 90 per cent fineness. From there it is lifted by an air vacuum system to storage and
the additional moisture driven off and from there it is dumped into the cooler pits and elevated to a storage bin of 600 tons capacity.
As needed the ground product then plaster of paris or stucco, is taken by spiral conveyor and elevators to a smaller bin above the
mixer and automatic sacker where it is prepared for commercial use and sacked for shipment and moved into the car alongside,
read for the consumer. All storage bins are built independent of the side walls of the main buildings to keep them free from any
moisture, which might be absorbed from the exterior walls.
The products of the plant will be plaster of paris, stucco, dental and casting plasters in addition to selling crushed gypsum rock to the
cement manufacturers. Three percent of all cement is composed of gypsum rock, which is shipped in bulk by the carload.
To be successful a gypsum company must have high-grade rock and large quantities of it as the rock sells for prices comparative with
coal. Therefore, the mining costs must be low, the quality high and markets accessible. The N.W.G.P. Co. has the latest approved
machinery and equipment obtainable, it's conveying and elevating machinery is largely eliminated by gravity and its rock supply
sufficient for several hundred years running at capacity, and the quality of the rock is perhaps as high in purity as is ever found. The
vein is 14 feet thick and lies in a large horizontal sheet with a slight dip to the west. The mining costs are low and dependable. It
assures the customer of a minimum of mine troubles at the source of this raw material and dependable deliveries. Electric drills are
used in the mine for borings and the room and pillar system of mining is followed.
Mr. G.J. McEntyre, the vice president and general manager, is well known to the gypsum industry having been associated with it for
the past twenty years. Mr. R.M. Calkins, Jr. the president and treasurer has been a resident of Montana for many years engaged in
various development enterprises and recently in the shipbuilding business in Seattle until coming to Montana to open up the
N.W.G.P. Co. this spring. The company maintains an office in Lewistown and employs from 25 to 30 men at its mill and mine near
Heath.